Just take a look at my gamercard in my sig to see if my Vita was worth the purchase. How many PS3 games did I play before I got my Vita and how many I've played after buying the Vita? The Vita library is very quickly picking up steam. Just last week: Monkey Ball, Street Fighter x Tekken, and Zero's Escape was released. This coming Tuesday: Assassin's Creed: Liberation, Smart As, Need for Speed, Ragnarok Odyssey, and LEGO Lord of the Rings. Not to mention the PSN games that are being released as well.
Most of the people saying the library sucks already had their minds made up for them by the Internet hivemind or an early experience with it. There are also some clowns who are looking for the console experience with the Vita but also expects the Vita to deliver an even better experience because otherwise "there's no point getting a Vita if I can just play it on my console".